Crankcase ventilation system, engine and vehicle

Abstract

The invention discloses a crankcase ventilation system, an engine and a vehicle. The crankcase ventilation system comprises a cylinder head cover, a ventilation device and a ventilation device, and the venturi structure is internally arranged and integrated in the cylinder head cover. According to the crankcase ventilation system, the Venturi structure is internally arranged and integrated in the cylinder head cover, and a plurality of pipelines and parts related to the Venturi structure and the cylinder head cover can also be integrated in the cylinder head cover, so that the pipelines can be saved, the space of an engine is saved, the number of parts of the engine is reduced, and the structure is simplified; the engine cost is reduced. Besides, due to the fact that a plurality of pipelines are integrated in the cylinder head cover, aging of the pipelines due to long-term use is avoided, the problems that an external pipe is prone to high-temperature aging and falling off are solved, waste gas leakage is avoided, and sealing performance is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a crankcase ventilation system, an engine and a vehicle. Background Art

[0002] In the prior art, crankcase ventilation systems require numerous connecting pipes and components, occupying a large space, increasing piping costs, and increasing the complexity of piping layout. Furthermore, the increased number of pipes reduces the sealing of the entire system, and the pipes are prone to aging and falling off over time. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a crankcase ventilation system that saves engine space, reduces the number of engine parts, lowers engine costs, and has good sealing performance.

[0004] The present invention also provides an engine, comprising the crankcase ventilation system described above.

[0005] The present invention also provides a vehicle, comprising the above-mentioned engine.

[0006] A crankcase ventilation system according to an embodiment of the present invention includes: a cylinder head cover; and a Venturi structure, wherein the Venturi structure is built into the cylinder head cover.

[0007] According to the crankcase ventilation system of an embodiment of the present invention, by integrating the Venturi structure within the cylinder head cover, many of the piping and components associated with the Venturi structure and the cylinder head cover are also integrated within the cylinder head cover. This saves piping, saves engine space, reduces the number of engine components, simplifies the structure, and reduces engine costs. Furthermore, since many piping are integrated within the cylinder head cover, they are not susceptible to aging due to long-term use, and the problem of external piping being susceptible to high-temperature aging and detachment is avoided, thereby preventing exhaust gas leakage and enhancing sealing.

[0008] According to some embodiments of the present invention, it also includes: a crankcase, which is located below the cylinder head cover; a first oil-gas separator, which is integrated on the cylinder head cover, the Venturi structure has a desorption chamber, the inlet of the first oil-gas separator is connected to the crankcase, and the outlet of the first oil-gas separator is connected to the desorption chamber in the cylinder head cover.

[0009] According to some embodiments of the present invention, the cylinder head cover has a Venturi outlet and a Venturi drive port connected to the desorption chamber, and the crankcase ventilation system also includes: an intake manifold, one end of which is connected to the intake duct; a supercharger, an outlet of the supercharger is connected to an end of the intake manifold facing away from the intake duct; an air filter, an outlet of the air filter is connected to an inlet of the supercharger, the Venturi outlet is connected between the air filter and the supercharger through an outlet connecting pipe, and the Venturi drive port is connected between the supercharger and the intake manifold through a drive pipe.

[0010] According to some embodiments of the present invention, the invention further includes: a first one-way valve, which is integrated on the cylinder head cover and connected in series between the outlet of the first oil-gas separator and the desorption chamber, and only allows oil and gas to flow from the first oil-gas separator to the desorption chamber.

[0011] According to some embodiments of the present invention, the system further includes a PRV valve, wherein the PRV valve is integrated on the cylinder head cover and connected in series between the outlet of the first oil-gas separator and the desorption chamber.

[0012] According to some embodiments of the present invention, the cylinder head cover has a venturi outlet connected to the desorption chamber, the venturi outlet is arranged on the upper surface of the cylinder head cover, and an outlet pipe is provided at the venturi outlet, and the outlet pipe extends upward.

[0013] In some embodiments of the present invention, the air outlet connecting pipe includes: a quick-connect connector, which is connected to the Venturi air outlet; and a connecting pipe body, one end of which is plugged into the quick-connect connector and the other end is connected between the air filter and the supercharger.

[0014] In some embodiments of the present invention, the quick-connect connector has a mounting hole, and the crankcase ventilation system further includes: a pressure sensor, which is disposed in the mounting hole and is used to detect the pressure at the venturi outlet.

[0015] In some embodiments of the present invention, the system further comprises an intercooler, wherein the intercooler is connected in series between the supercharger and the intake manifold, and the end of the drive pipe facing away from the venturi drive port is connected to the intercooler.

[0016] In some embodiments of the present invention, the invention further comprises an air supply pipe, one end of which is connected to the crankcase, and the other end of which is connected between the air filter and the supercharger.

[0017] In some embodiments of the present invention, the air filter further comprises a second one-way valve, wherein the second one-way valve is connected in series to the air supply pipe and only allows air to flow from the air filter to the crankcase.

[0018] In some embodiments of the present invention, the present invention further includes: a second oil-gas separator, the second oil-gas separator is integrated on the cylinder head cover, the inlet of the second oil-gas separator is connected to the crankcase, and the outlet of the second oil-gas separator is connected to the intake duct.

[0019] In some embodiments of the present invention, the outlet of the second oil-gas separator is connected to the intake passage via a communication channel, and a portion of the communication channel is located inside the cylinder head cover.

[0020] In some embodiments of the present invention, the system further includes a PCV valve connected between the outlet of the second oil-gas separator and the intake passage.

[0021] According to some embodiments of the present invention, the cylinder head cover has a Venturi drive port connected to the desorption chamber, the Venturi structure is provided with an injection member, the injection member has an injection hole connected to the desorption chamber and the Venturi drive port, the cross-sectional area of the injection hole gradually decreases in the direction toward the desorption chamber, and the injection member is detachably arranged in the cylinder head cover; and / or, the cylinder head cover has a Venturi outlet connected to the desorption chamber, the Venturi structure is provided with a diffuser, the diffuser has a diffusion hole connected to the desorption chamber and the Venturi outlet, the cross-sectional area of the diffusion hole gradually increases in the direction away from the desorption chamber, and the diffuser is detachably arranged in the cylinder head cover.

[0022] An engine according to an embodiment of the present invention includes the above-mentioned crankcase ventilation system.

[0023] According to an embodiment of the present invention, the engine, by providing the aforementioned crankcase ventilation system, integrates the Venturi structure within the cylinder head cover. Many of the piping and components associated with the Venturi structure and the cylinder head cover are also integrated within the cylinder head cover. This saves piping, saves engine space, reduces the number of engine components, simplifies the structure, and reduces engine cost. Furthermore, since many piping are integrated within the cylinder head cover, they are not susceptible to aging due to long-term use, and the problem of external piping being susceptible to high-temperature aging and detachment is avoided, thereby preventing exhaust gas leakage and enhancing sealing.

[0024] A vehicle according to an embodiment of the present invention includes the above-mentioned engine.

[0025] According to an embodiment of the present invention, a vehicle equipped with the aforementioned engine, including the aforementioned crankcase ventilation system, integrates the Venturi structure within the cylinder head cover. Many of the piping and components associated with the Venturi structure and the cylinder head cover are also integrated within the cylinder head cover. This saves piping, saves engine space, reduces the number of engine components, simplifies the structure, and reduces engine costs. Furthermore, since many piping are integrated within the cylinder head cover, they are not susceptible to aging due to long-term use, and the problem of external piping being susceptible to high-temperature aging and detachment is avoided, thereby preventing exhaust gas leakage and enhancing sealing.

[0026] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0028] Figure 1 is a perspective view of a cylinder head cover and its attached structures of a crankcase ventilation system according to an embodiment of the present invention;

[0029] Figure 2 is a perspective view from another angle of a cylinder head cover and its attached structures of a crankcase ventilation system according to an embodiment of the present invention, wherein a drive pipe and an outlet connecting pipe are not shown;

[0030] Figure 3 is a perspective view of an outlet connecting pipe of a crankcase ventilation system according to an embodiment of the present invention;

[0031] Figure 4 is a connection diagram of a crankcase ventilation system according to an embodiment of the present invention;

[0032] Figure 5 is a cross-sectional view of a cylinder head cover of a crankcase ventilation system at a PRV valve and a first one-way valve according to an embodiment of the present invention;

[0033] Figure 6 is a schematic diagram of the airflow direction in the first one-way valve of a crankcase ventilation system according to an embodiment of the present invention;

[0034] Figure 7 is a schematic diagram of the airflow direction in the desorption chamber of the crankcase ventilation system according to an embodiment of the present invention;

[0035] Figure 8 is a cross-sectional view of a Venturi structure of a crankcase ventilation system according to an embodiment of the present invention;

[0036] Figure 9FIG. 4 is a cross-sectional view of a venturi structure of a crankcase ventilation system according to an embodiment of the present invention from another angle.

[0037] Reference numerals:

[0038] 100. Crankcase ventilation system;

[0039] 1. Cylinder head cover;

[0040] 2. Crankcase;

[0041] 3. Venturi structure; 31. Desorption chamber; 32. Venturi outlet; 33. Outlet pipe; 34. Venturi drive port;

[0042] 35. Drive tube; 36. Injection element; 361. Injection hole; 37. Diffuser; 371. Diffuser hole; 38. Outlet connecting pipe;

[0043] 381, quick-connect connector; 3811, mounting hole; 382, connecting pipe body;

[0044] 4. First oil-gas separator; 41. First one-way valve; 42. PRV valve;

[0045] 5. Air supply pipe; 51. Second one-way valve;

[0046] 6. Second oil-gas separator; 61. Communication channel; 62. PCV valve;

[0047] 7. The third one-way valve;

[0048] 81. Intake manifold; 82. Supercharger; 83. Air filter; 84. Intercooler; 85. Throttle body; 86. Cylinder head; 87. Oil pan;

[0049] a. Driving airflow; b. Blowby gas; c. Mixed gas. DETAILED DESCRIPTION

[0050] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0052] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0053] Reference below Figures 1-9 A crankcase ventilation system 100 according to an embodiment of the present invention is described.

[0054] like Figure 1 and Figure 2 As shown, combined Figure 4 The crankcase ventilation system 100 includes a cylinder head cover 1 and a Venturi structure 3 .

[0055] Specifically, the Venturi structure 3 is built-in and integrated in the cylinder head cover 1. Since the Venturi structure 3 is integrated in the cylinder head cover 1, many pipes and components related to the Venturi structure 3 and the cylinder head cover 1 can also be integrated in the cylinder head cover 1, which can save pipes, save engine space, reduce the number of engine parts, simplify the structure, and reduce engine costs.

[0056] In addition, since many pipelines are integrated into the cylinder head cover 1, the pipelines will not age due to long-term use, and the problem of external pipes being prone to high-temperature aging and falling off is avoided, thereby avoiding exhaust gas leakage and enhancing sealing.

[0057] According to the crankcase ventilation system 100 of the present invention, by integrating the Venturi structure 3 within the cylinder head cover 1, many of the pipes and components associated with the Venturi structure 3 and the cylinder head cover 1 are also integrated within the cylinder head cover 1. This saves pipes, saves engine space, reduces the number of engine components, simplifies the structure, and reduces engine costs. Furthermore, since many pipes are integrated within the cylinder head cover 1, they are not susceptible to aging due to long-term use, and the problem of external pipes being susceptible to high-temperature aging and detachment is avoided, thereby preventing exhaust gas leakage and enhancing sealing.

[0058] like Figure 1 and Figure 2 As shown, combined Figure 4 The crankcase ventilation system 100HIA includes a crankcase 2 and a first oil-gas separator 4. The crankcase 2 is located below the cylinder head cover 1, and the venturi structure 3 has a desorption chamber 31 (reference Figure 8 ), the first oil-gas separator 4 is integrated into the cylinder head cover 1. The inlet of the first oil-gas separator 4 communicates with the crankcase 2, and the outlet of the first oil-gas separator 4 communicates with the desorption chamber 31 within the cylinder head cover 1. During engine operation, a portion of the high-pressure mixture in the combustion chamber enters the crankcase 2 through the gap between the piston ring and the cylinder bore, forming blowby gas b. This blowby gas b enters the engine's intake system through the crankcase ventilation system 100, and ultimately enters the combustion chamber and participates in combustion.

[0059] The inlet of the first oil-gas separator 4 is connected to the crankcase 2, and the outlet of the first oil-gas separator 4 is connected to the desorption chamber 31. The blowby gas b in the crankcase 2 enters the first oil-gas separator 4 for oil-gas separation, and the separated gas enters the desorption chamber 31. In the present application, the first oil-gas separator 4 and the Venturi structure 3 are both integrated into the cylinder head cover 1, so that the first oil-gas separator 4 and the Venturi structure 3 are integrated, and the outlet of the first oil-gas separator 4 is connected to the desorption chamber 31 within the cylinder head cover 1. There is no need to set up a separate desorption pipeline to connect the outlet of the first oil-gas separator 4 and the desorption chamber 31, which saves engine space, reduces the number of engine parts, and reduces engine cost. In addition, since the desorption pipeline between the outlet of the first oil-gas separator 4 and the desorption chamber 31 is eliminated, the pipeline will not age due to long-term use, and the problem of external pipes being easily aged and easily falling off due to high temperatures is avoided, thereby preventing exhaust gas leakage and improving sealing performance.

[0060] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the cylinder head cover 1 has a venturi outlet 32 and a venturi drive port 34 connected to the desorption chamber 31. Figure 4 As shown, crankcase ventilation system 100 also includes an intake manifold 81 , a supercharger 82 , and an air filter 83 .

[0061] Specifically, one end of the intake manifold 81 communicates with the intake duct, which in turn connects to the combustion chamber via the intake duct. The intake duct is located on the cylinder head 86, which is located between the cylinder head cover 1 and the crankcase 2. The intake manifold 81 primarily distributes air to the intake ducts of each cylinder. The outlet of the supercharger 82 communicates with the end of the intake manifold 81 facing away from the intake duct, while the outlet of the air filter 83 communicates with the inlet of the supercharger 82. The supercharger 82 pre-compresses air before supplying it to the combustion chambers of the cylinders, increasing air density, air intake volume, power, fuel economy, and emissions. The air filter 83 filters out dust and grit from the air, ensuring sufficient, clean air enters the cylinders. This prevents suspended dust from being drawn into the cylinders, which could accelerate wear on the piston assembly and cylinders. Larger particles entering the space between the piston and cylinder could also cause severe "cylinder scuffing."

[0062] The venturi outlet 32 is connected between the air filter 83 and the supercharger 82 through the outlet connecting pipe 38, and the venturi drive port 34 is connected between the supercharger 82 and the intake manifold 81 through the drive pipe 35. Figure 4 and Figure 8 When the engine is operating at medium to high load or full load, after the supercharger 82 intervenes, under the action of the supercharger 82, the air passes through the air filter 83, a portion of which enters the intake manifold 81 and then enters the combustion chamber for combustion. A very small portion enters the desorption chamber 31 through the drive pipe 35 and the Venturi drive port 34. When the high-pressure airflow passes through the injection hole 361, a negative pressure is formed in the desorption chamber 31. The blowby gas b in the crankcase 2 passes through the first oil-gas separator 4 and enters the desorption chamber 31. After mixing with the air entering from the Venturi drive port 34, it is discharged to the upstream side of the supercharger 82 through the Venturi outlet 32 to participate in the next circulation flow.

[0063] Since the Venturi outlet 32 is connected to the outlet of the air filter 83, in winter, when the engine is running for a short time, condensed water will gather at the Venturi outlet 32, thereby creating a risk of freezing. After the ice blocks the Venturi outlet 32, the air flow entering the Venturi drive port 34 through the drive pipe 35 will enter the crankcase 2 through the desorption chamber 31 and the first oil-gas separator 4, increasing the loss of the supercharged air flow and causing the pressure of the crankcase 2 to increase, which will not only increase the engine fuel consumption, but also cause the front and rear crankshaft oil seals to have a risk of oil leakage.

[0064] In other embodiments of the present invention, the venturi structure 3 of the present invention may not have the venturi driving port 34, and is used when the naturally aspirated engine has no driving pressure.

[0065] In some embodiments of the present invention, Figure 4 As shown, combined Figure 5 and Figure 6The crankcase ventilation system 100 also includes a first one-way valve 41, which is integrated into the cylinder head cover 1 and connected in series between the outlet of the first oil-gas separator 4 and the desorption chamber 31. This valve only allows oil and gas to flow from the first oil-gas separator 4 to the desorption chamber 31. This prevents ice from clogging the Venturi outlet 32 after the air filter 83, which could cause airflow from the Venturi drive port to pass through the desorption chamber 31 and the first oil-gas separator 4 and enter the engine crankcase 2. It also eliminates the risk of oil leakage from the front and rear crankshaft oil seals.

[0066] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the Venturi outlet 32 is provided on the upper surface of the cylinder head cover 1. An outlet pipe 33 is provided at the Venturi outlet 32, extending upward. This prevents condensed water from accumulating in the outlet pipe 33, thereby eliminating the risk of freezing and blocking the Venturi outlet 32. This prevents freezing and clogging the Venturi outlet 32 after the air filter 83, which could cause airflow from the Venturi drive port 34 to pass through the desorption chamber 31 and the first oil-gas separator 4 and enter the engine crankcase 2. This also eliminates the risk of oil leakage from the front and rear crankcase oil seals.

[0067] In some embodiments of the present invention, a third one-way valve 7 is disposed below the first one-way valve 41 to promptly return condensate to the crankcase 2, thereby preventing ice from accumulating in the upper chamber of the first one-way valve 41. Furthermore, an oil pan 87 is disposed at the bottom of the crankcase 2.

[0068] In some embodiments of the present invention, Figure 2 and Figure 4 As shown, the crankcase ventilation system 100 also includes a PRV (pressure regulating valve) valve 42. The PRV valve 42 is integrated into the cylinder head cover 1 and connected in series between the outlet of the first oil-gas separator 4 and the desorption chamber 31. The PRV valve 42 can be used to regulate the pressure in the crankcase 2 to ensure that the negative pressure in the crankcase 2 is not excessive (less than -10 kPa), thereby ensuring the reliability of engine operation and the normal operation of the entire crankcase ventilation system 100.

[0069] Optionally, the PRV valve 42 is located between the first one-way valve 41 and the outlet of the first oil-gas separator 4 .

[0070] In some embodiments of the present invention, Figure 1 and Figure 3As shown, the outlet connecting pipe 38 includes a quick-connector 381 and a connecting pipe body 382. The quick-connector 381 is plugged into the venturi outlet 32. One end of the connecting pipe body 382 is connected to the quick-connector 381, and the other end is connected between the air filter 83 and the supercharger 82. Thus, the quick-connector 381 and the venturi outlet 32 can be plugged into each other to achieve a connection between the quick-connector 381 and the venturi outlet 32, thereby facilitating the connection between the outlet connecting pipe 38 and the venturi outlet 32.

[0071] Furthermore, an air outlet pipe 33 is provided at the venturi air outlet 32, and the quick-connect connector 381 is plug-connected to the air outlet pipe 33.

[0072] In some embodiments of the present invention, Figure 3 As shown, quick-connect connector 381 has a mounting hole 3811. Crankcase ventilation system 100 also includes a pressure sensor (not shown) located within mounting hole 3811 for detecting pressure at venturi outlet 32. By detecting pressure at venturi outlet 32 via the pressure sensor, leaks caused by pipeline damage can be detected. This helps address leak diagnosis needs in regions with stringent emissions regulations and meets the stringent OBD (On-Board Diagnostics) monitoring requirements of North American regulations. In this case, the pressure sensor can meet these emissions requirements.

[0073] In some embodiments of the present invention, Figure 4 As shown, crankcase ventilation system 100 further includes an intercooler 84, which is connected in series between supercharger 82 and intake manifold 81. The end of drive pipe 35 facing away from Venturi drive port 34 is connected to intercooler 84. Intercooler 84 is used to reduce the temperature of the supercharged high-temperature air, increase intake air density, and increase intake air volume, thereby increasing engine power.

[0074] In addition, a throttle body 85 is provided between the intercooler 84 and the intake manifold 81. The throttle body 85 is a valve that controls the amount of air intake by the engine.

[0075] In some embodiments of the present invention, Figure 4 As shown, the crankcase ventilation system 100 further includes an air supply pipe 5, one end of which is in communication with the crankcase 2, and the other end of which is connected between the air filter 83 and the supercharger 82. When the crankcase 2 is under negative pressure, due to the pressure difference between the area after the air filter 83 and the crankcase 2, some fresh air enters the crankcase 2 through the air supply pipe 5, thereby reducing the risk of sludge formation and oil emulsification.

[0076] Furthermore, if Figure 4As shown, the crankcase ventilation system 100 further includes a second one-way valve 51, which is connected in series to the air supply pipe 5 and allows only filtered clean air to flow from the air filter 83 into the crankcase 2. This allows the crankcase 2 to be supplied with air even when the crankcase 2 is under negative pressure. It also prevents blowby gas (b) within the crankcase 2 from flowing through the air supply pipe 5 toward the position behind the air filter 83, thus preventing unseparated oil from entering components such as the supercharger 82 and the venturi mechanism 3.

[0077] In some embodiments of the present invention, Figure 4 As shown, crankcase ventilation system 100 also includes a second oil-gas separator 6, which is integrated into cylinder head cover 1. The inlet of second oil-gas separator 6 communicates with crankcase 2, and the outlet of second oil-gas separator 6 communicates with the intake duct, thereby connecting to the combustion chamber via the intake duct. During engine idling and low-load conditions, due to the negative pressure within intake manifold 81, the pressure differential between crankcase 2 and intake manifold 81 causes blowby gas (b) within crankcase 2 to pass through second oil-gas separator 6, enter the engine intake duct, and ultimately enter the combustion chamber for combustion.

[0078] Furthermore, if Figure 1 、 Figure 2 and Figure 4 As shown, the outlet of the second oil-gas separator 6 communicates with the intake duct via a communication channel 61. Specifically, this facilitates communication between the outlet of the second oil-gas separator 6 and the intake duct. A portion of the communication channel 61 is located within the cylinder head cover 1, while the remaining portion is located within the cylinder head 86. This prevents freezing of the pipelines in winter, which could block gas flow. This creates a positive pressure in the crankcase 2 and prevents the risk of oil leaks from the crankcase 2 oil seal. This also meets OBD diagnostic exemption requirements while reducing piping layout and increasing costs and efficiency.

[0079] In some embodiments of the present invention, Figure 4 As shown, crankcase ventilation system 100 also includes a PCV (Positive Crankcase Ventilation) valve 62, which is connected between the outlet of second oil-gas separator 6 and the intake passage. PCV valve 62 regulates the flow in communication passage 61, thereby controlling the pressure. During medium- to high-load and full-load engine operation, when supercharger 82 is engaged, the intake manifold 81 is under positive pressure. PCV valve 62 acts as a one-way valve, preventing gas in intake manifold 81 from entering crankcase 2.

[0080] In some embodiments of the present invention, Figure 8As shown, the cylinder head cover 1 has a Venturi drive port 34 connected to the desorption chamber 31. The Venturi structure 3 is provided with an injection member 36. The injection member 36 has a spray hole 361 connecting the desorption chamber 31 and the Venturi drive port 34. The cross-sectional area of the spray hole 361 gradually decreases toward the desorption chamber 31. The injection member 36 is detachably mounted within the cylinder head cover 1. The injection member 36 is manufactured in a modular manner. This allows for the replacement of different injection members 36, and thus spray holes 361 of different sizes, to meet varying desorption flow rates (engine piston blowby). This reduces manufacturing costs and cycle time.

[0081] Optionally, the injection hole 361 is conical. Of course, the present invention is not limited thereto. In a plane passing through the central axis of the injection hole 361 , the contour line of the injection hole 361 may be a hyperbola.

[0082] In some embodiments of the present invention, Figure 8 As shown, the cylinder head cover 1 has a Venturi outlet 32 connected to the desorption chamber 31. A diffuser 37 is provided within the Venturi structure 3. The diffuser 37 has a diffusion hole 371 connecting the desorption chamber 31 and the Venturi outlet 32. The cross-sectional area of the diffusion hole 371 gradually increases in the direction away from the desorption chamber 31. The diffuser 37 is detachably mounted within the cylinder head cover 1. The diffuser 37 is manufactured in a modular manner, allowing for different diffusers 37 to be replaced with diffuser holes 371 of different sizes to meet varying desorption flow rates (engine piston blowby), thereby reducing manufacturing costs and cycle time.

[0083] In this application, combined Figure 5-Figure 9 When the engine is working, a part of the high-pressure mixed gas in the combustion chamber will enter the crankcase 2 through the gap between the piston ring and the cylinder hole to form blowby gas b. The blowby gas b will eventually enter the engine intake system through the first oil-gas separator 4 or the second oil-gas separator 6 of the crankcase ventilation system 100 and the crankcase 2 ventilation pipe, and finally enter the combustion chamber to participate in combustion.

[0084] When the engine is idling or under low load conditions, the second oil-gas separator 6 is connected to the intake duct of the combustion chamber. Under the action of the intake negative pressure, the blowby gas b in the crankcase 2 passes through the second oil-gas separator 6 and returns to the engine combustion chamber through the PCV valve 62 for re-combustion, while maintaining the crankcase 2 pressure at a negative pressure. At this time, the pressure is controlled by the plunger-type PCV valve 62.

[0085] During medium-to-high load and full-load engine operation, after the supercharger 82 is engaged, the intake duct is under positive pressure, the PCV valve 62 functions as a one-way valve, and the second oil-gas separator 6 is disconnected from the intake duct. At this point, the crankcase 2 is connected to the upstream side of the supercharger 82. The gas in the crankcase 2 that has undergone the first oil-gas separation is drawn upstream of the supercharger 82 by the negative pressure effect of the Venturi, and ultimately returns to the engine combustion chamber for re-combustion.

[0086] Specifically, the Venturi structure 3 of the present invention functions reliably. High-pressure driving airflow a (the supercharged, high-pressure gas, generating negative pressure when passing through the Venturi structure 3, is therefore referred to as driving airflow a) after intercooling in the intercooler 84 passes through the drive pipe 35, out of the Venturi drive port 34, and into the desorption chamber 31. As it passes through the injection hole 361, the gas velocity increases due to the gradually decreasing flow area. According to Bernoulli's principle, the pressure on the same streamline decreases, thus forming a jet-like negative pressure of a certain length L within the desorption chamber 31 behind the injection hole 361. Under the action of negative pressure, the crankcase 2 blowby gas b, combined with the driving airflow a, converges through the diffuser 371 to form a mixed gas c. The mixed gas c then flows through the Venturi outlet 32 to the upstream side of the supercharger 82, ultimately entering the engine combustion chamber for combustion.

[0087] The Venturi crankcase ventilation system 100 of the present invention is highly reliable. Blowby gas b from the crankcase 2 passes through the first oil-gas separator 4, then through the PRV valve 42 and the first check valve 41 before entering the desorption chamber 31 of the Venturi structure 3. The first check valve 41 effectively prevents the driving airflow a from flowing through the desorption chamber 31 and back into the crankcase 2 if the Venturi outlet 32 becomes clogged, thereby increasing the crankcase 2 pressure to a positive level and eliminating the risk of oil leakage from the front and rear crankshaft oil seals.

[0088] The present invention completely eliminates the need to install a desorption pipe for the crankcase 2, thereby reducing engine costs and achieving a negative pressure requirement for the crankcase 2 in the entire universal characteristics of the engine.

[0089] Furthermore, according to the crankcase 2 pollutant emission requirements in GB18352.6-2016 (Light-Duty Vehicle Pollutant Emission Limits and Measurement Methods), under all specified operating conditions, the measured crankcase 2 pressure must not exceed atmospheric pressure at the time of measurement. Therefore, regardless of whether the engine is used in a gasoline or hybrid vehicle, the crankcase 2 pressure requirement must be negative.

[0090] Next, an engine according to an embodiment of the present invention will be described.

[0091] The engine according to the embodiment of the present invention includes the crankcase ventilation system 100 described above.

[0092] According to an embodiment of the present invention, the engine, by providing the aforementioned crankcase ventilation system 100, integrates the Venturi structure 3 within the cylinder head cover 1. Many of the pipes and components associated with the Venturi structure 3 and the cylinder head cover 1 are also integrated within the cylinder head cover 1. This saves pipes, saves engine space, reduces the number of engine components, simplifies the structure, and reduces engine costs. Furthermore, since many pipes are integrated within the cylinder head cover 1, they are not susceptible to aging due to long-term use, and the problem of external pipes being susceptible to high-temperature aging and detachment is avoided, thereby preventing exhaust gas leakage and enhancing sealing performance.

[0093] Next, a vehicle according to an embodiment of the present invention will be described.

[0094] A vehicle according to an embodiment of the present invention includes the above-mentioned engine.

[0095] According to an embodiment of the present invention, a vehicle equipped with the aforementioned engine, including the aforementioned crankcase ventilation system 100, integrates the Venturi structure 3 within the cylinder head cover 1. Many of the pipes and components associated with the Venturi structure 3 and the cylinder head cover 1 are also integrated within the cylinder head cover 1. This saves pipes, saves engine space, reduces the number of engine components, simplifies the structure, and reduces engine costs. Furthermore, since many pipes are integrated within the cylinder head cover 1, they are not susceptible to aging due to long-term use, and the problem of external pipes being susceptible to high-temperature aging and detachment is avoided, thereby preventing exhaust gas leakage and enhancing sealing performance.

[0096] The structure and operation of the engine of the vehicle according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0097] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0098] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A crankcase ventilation system, characterized in that: include: Cylinder head cover (1); A Venturi structure (3) is built into the cylinder head cover (1).

2. The crankcase ventilation system according to claim 1, characterized in that Also includes: a crankcase (2), the crankcase (2) being located below the cylinder head cover (1); A first oil-gas separator (4) is integrated on the cylinder head cover (1); the Venturi structure (3) has a desorption chamber (31); an inlet of the first oil-gas separator (4) is connected to the crankcase (2); and an outlet of the first oil-gas separator (4) is connected to the desorption chamber (31) in the cylinder head cover (1).

3. The crankcase ventilation system according to claim 2, characterized in that The cylinder head cover (1) is provided with a venturi outlet (32) and a venturi drive port (34) communicating with the desorption chamber (31), and the crankcase ventilation system (100) further comprises: an intake manifold (81), one end of the intake manifold (81) being in communication with the intake duct; a supercharger (82), wherein an outlet of the supercharger (82) is in communication with an end of the intake manifold (81) facing away from the intake duct; An air filter (83) is provided, wherein the outlet of the air filter (83) is connected to the inlet of the supercharger (82), the venturi outlet (32) is connected between the air filter (83) and the supercharger (82) through an outlet connecting pipe (38), and the venturi drive port (34) is connected between the supercharger (82) and the intake manifold (81) through a drive pipe (35).

4. The crankcase ventilation system according to claim 2, characterized in that Also includes: A first one-way valve (41) is integrated on the cylinder head cover (1) and connected in series between the outlet of the first oil-gas separator (4) and the desorption chamber (31), allowing only oil and gas to flow from the first oil-gas separator (4) to the desorption chamber (31).

5. The crankcase ventilation system according to claim 2, wherein: Also includes: A PRV valve (42) is integrated on the cylinder head cover (1) and connected in series between the outlet of the first oil-gas separator (4) and the desorption chamber (31).

6. The crankcase ventilation system according to claim 2, wherein: The cylinder head cover (1) is provided with a venturi outlet (32) communicating with the desorption chamber (31); the venturi outlet (32) is arranged on the upper surface of the cylinder head cover (1); an outlet pipe (33) is provided at the venturi outlet (32); and the outlet pipe (33) extends upward.

7. The crankcase ventilation system according to claim 3, characterized in that The gas outlet connecting pipe (38) comprises: A quick-connect connector (381), the quick-connect connector (381) being connected to the venturi outlet (32); A connecting pipe body (382), one end of which is plugged into the quick-connect connector (381), and the other end of which is connected between the air filter (83) and the supercharger (82).

8. The crankcase ventilation system according to claim 7, characterized in that The quick-connect connector (381) has a mounting hole (3811), and the crankcase ventilation system (100) further includes: A pressure sensor is provided in the mounting hole (3811) and is used to detect the pressure at the Venturi outlet (32).

9. The crankcase ventilation system according to claim 3, wherein: Also includes: An intercooler (84) is connected in series between the supercharger (82) and the intake manifold (81), and one end of the drive pipe (35) facing away from the Venturi drive port (34) is connected to the intercooler (84).

10. The crankcase ventilation system according to claim 3, wherein: Also includes: An air supply pipe (5), one end of which is in communication with the crankcase (2), and the other end of which is connected between the air filter (83) and the supercharger (82).

11. The crankcase ventilation system according to claim 10, wherein: Also includes: A second one-way valve (51) is connected in series to the air supply pipe (5) and only allows air to flow from the air filter (83) to the crankcase (2).

12. The crankcase ventilation system according to claim 2, wherein: Also includes: A second oil-gas separator (6), the second oil-gas separator (6) is integrated on the cylinder head cover (1), the inlet of the second oil-gas separator (6) is connected to the crankcase (2), and the outlet of the second oil-gas separator (6) is connected to the intake duct.

13. The crankcase ventilation system according to claim 12, wherein: The outlet of the second oil-gas separator (6) is connected to the intake passage via a communication channel (61), and a portion of the communication channel (61) is located inside the cylinder head cover (1).

14. The crankcase ventilation system of claim 12, wherein: Also includes: A PCV valve (62) is connected between the outlet of the second oil-gas separator (6) and the intake passage.

15. The crankcase ventilation system of claim 2, wherein: The cylinder head cover (1) is provided with a venturi drive port (34) communicating with the desorption chamber (31); an injection member (36) is provided in the venturi structure (3); the injection member (36) is provided with an injection hole (361) communicating with the desorption chamber (31) and the venturi drive port (34); the cross-sectional area of the injection hole (361) gradually decreases in a direction toward the desorption chamber (31); the injection member (36) is detachably provided in the cylinder head cover (1); And / or, the cylinder head cover (1) has a venturi outlet (32) connected to the desorption chamber (31), the venturi structure (3) is provided with a diffuser (37), the diffuser (37) has a diffusion hole (371) connected to the desorption chamber (31) and the venturi outlet (32), the cross-sectional area of the diffusion hole (371) gradually increases in a direction away from the desorption chamber (31), and the diffuser (37) is detachably provided in the cylinder head cover (1).

16. An engine, characterized in that: Comprising a crankcase ventilation system (100) according to any one of claims 1-15.

17. A vehicle, characterized in that: Comprising an engine according to claim 16.

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